Blade Means for a Mixer

Abstract

The invention relates to a blade means (1) for a mixer, e.g. an immersion blender (2) or stand mixer, which at least comprises: a rotational shaft (3); at least one blade (4) which extends from the rotational shaft (3) and has at least one cutting edge (5); and a plurality of serrations (6) which are formed in the at least one cutting edge (5), wherein the individual serrations (6) are spaced apart from one another by a planar portion (7) of the at least one cutting edge (5), wherein the planar portion (7) of the at least one cutting edge (5) is less sharp than the serrations (6).

Claims

1. A blade for a blender, at least comprising: a rotation axis; at least one knife which extends so as to proceed from the rotation axis and has at least one cutter; and a plurality of serrations which are configured in the at least one cutter, wherein individual serrations are in each case mutually spaced apart by a flat portion of the at least one cutter; wherein the flat portion of the at least one cutter has a sharpness that is inferior to that of the serrations.

2. The blade as claimed in claim 1, wherein the serrations have a first cutter thickness of at most 0.2 mm, and the flat portion has a second cutter thickness of 0.2 to 1.0 mm.

3. The blade as claimed in claim 1, wherein the serrations run from a radially inward serration starting point to a radially outward serration finishing point, and wherein a first spacing between the serration starting point and an apex of the serration is smaller than a second spacing between the apex and the serration finishing point.

4. The blade as claimed in claim 3, wherein the serrations at the serration starting point have a first gradient, and at the serration finishing point have a second gradient, and wherein the value of the first gradient differs from the value of the second gradient.

5. The blade as claimed in claim 3, wherein a first tangent that contacts a first center between the serration starting point and the apex intersects a central axis of the at least one knife so as to form a first angle (α), and a second tangent that contacts a second center between the apex and the serration finishing point intersects the central axis so as to form a second angle (β).

6. The blade as claimed in claim 5, wherein the first angle (α) is larger than the second angle (β).

7. The blade as claimed in claim 5, wherein the first angle (α) is more than 50° and less than 90°.

8. The blade as claimed in claim 5, wherein the second angle (β) is 10° to 45°.

9. The blade as claimed in claim 1, wherein a depth of the serrations corresponds to at most 50% of a serration width of the serrations.

10. The blade as claimed in claim 1, wherein the flat portion of the at least one cutter has a radiused cutting edge.

Description

[0036] The invention as well is the technical environment will be explained in more detail hereunder by means of the figures. It is to be pointed out that the figures show a particularly preferred variant of embodiment of the invention, the latter however not being limited thereto. Identical components in the figures here are provided with the same reference signs. In the figures, in an exemplary and schematic manner:

[0037] FIG. 1 shows a hand blender in a lateral view;

[0038] FIG. 2 shows a blade in a plan view;

[0039] FIG. 3 shows a serration of a cutter of the blade in an enlarged illustration;

[0040] FIG. 4 shows a first variant of the serration having a cutter thickness>0 mm in a sectional illustration;

[0041] FIG. 4* shows a second variant of the serration having a cutter thickness=0 mm in a sectional illustration;

[0042] FIG. 5 shows a first variant of a flat portion of the cutter having a cutter thickness>0 mm in a sectional illustration; and

[0043] FIG. 6 shows a second variant of a flat portion of the cutter having a radiused cutting edge in a sectional illustration.

[0044] FIG. 1 as an exemplary field of application of the blade according to the invention shows a hand blender 2 in a lateral view. The hand blender 2 comprises a housing 24 having a cutting head 25. A blade 1, which is not visible here, is disposed in the cutting head 25, said blade 1 during the operation of the hand blender 2 for comminuting ingredients to be cut being rotatable by a drive of the hand blender 2.

[0045] FIG. 2 shows the blade 1 in the plan view, that is to say from the bottom to the top in FIG. 2. The blade 1 in the center thereof has an opening 26 for a drive shaft of the hand mixer 2 shown in FIG. 1, the blade 1 by said drive shaft being rotatable about a rotation axis 3. The rotation axis 3 here runs perpendicular to the drawing plane. In the variant of embodiment shown here, two knives 4 extend from the rotation axis 3 in two opposite radial directions 27. The knives 4 have a central axis 19. The central axis 19 here runs through the rotation axis 3 and so as to be centric through the knives 4. One cutter 5 is configured on each knife 4, said cutter 5 in the variant of embodiment shown here having in each case three serrations 6. The serrations 6 are ground into the cutters 5 and in the radial direction 27 mutually spaced apart by flat portions 7 of the cutter 5. The flat portions 7 have a portion width 36 which here is 3 mm. The serrations 6 are therefore mutually spaced apart by the portion width 36. The cutters 5 furthermore have in each case a flat end region 28 having an end region width 29 of at least 5 mm. The flat end region 28 extends from the radially outermost serration 6 to a tip 30 of the knives 4. The tips 30 of the knives 4, as opposed to the variant of embodiment shown in FIG. 2, can also be bent upward.

[0046] FIG. 3 shows an enlarged illustration of the serration 6 in the region 31 of the knife 4, as marked in FIG. 2. The serration 6 extends from a radially inward serration starting point 10 to a radially outward serration finishing point 11. The serration starting point 10 and the serration finishing point 11 lie on a cutting edge 32 of the cutter 5. The serration 6 moreover has an apex 13. The apex 13 is that point of the serration 6 where the serration 6 has the maximum depth 22 thereof. Furthermore, the serration 6 has the smallest radius of curvature thereof in the apex 13. Proceeding from the apex 13, the radius of curvature of the serration 6 has a smaller gradient in the direction of the serration starting point 10 than in the direction of the serration finishing point 11. The depth 22 is the perpendicular spacing between a connecting line 33, which runs between the serration starting point 10 and the serration finishing point 11, and the serration 6. A first spacing 12 between the serration starting point 10 and the apex 13 is smaller than a second spacing 14 between the apex 13 and the serration finishing point 11. Moreover, the serration 6 has a serration width 23 which extends from the serration starting point 10 to the serration finishing point 11.

[0047] At the starting point 10, the serration 6 has a first gradient 15 in relation to the connecting line 33 and/or the cutting edge 32, and at the serration finishing point 11 has a second gradient 16 in relation to the connecting line 33 and/or the cutting edge 32. The value of the first gradient 15 is larger than the value of the second gradient 16.

[0048] Furthermore, the serration 6 has a first center 17 and a second center 20. The first center 17 on the serration 6 is situated precisely between the serration starting point 10 and the apex 13. In other words, this means that the first center 17 has the same spacing from the serration starting point 10 as from the apex 13. The second center 20 on the serration 6 is situated precisely between the apex 13 and the serration finishing point 11. In other words, this means that the second center 20 has the same spacing from the apex 13 as from the serration finishing point 11. A first tangent 18 of the serration 6 that contacts the first center 17 intersects the central axis 19 of the knife 4 so as to form a first angle α. A second tangent 21 of the serration 6 that contacts the second center 20 intersects the central axis 19 of the knife 4 so as to form a second angle β. The first angle α here is 60°, and the second angle β is 17°. In the rotation of the blade 1, the ingredients to be cut, not shown here, as a result thereof impact the portion of the serration 6 between the apex 13 and the serration finishing point 11 approximately at an angle of 90°, as a result of which a high cutting performance of the blade 1 is achievable.

[0049] FIG. 4 shows a section through a first variant of the serration 6, along the section line IV-IV shown in FIG. 2. The serration 6 has a first cutter thickness 8 of 0.1 mm and a first cutting angle 34 of 33°.

[0050] FIG. 4* shows a section through a second variant of the serration 6, along the section line IV-IV shown in FIG. 2. The serration 6 has a first cutter thickness 8 of 0 mm and thus a cutter which is ground to the maximum sharpness.

[0051] FIG. 5 shows a section through a first variant of the flat portion 7, along the section line V-V shown in FIG. 2. The flat portion 7 has a second cutter thickness 9 of 0.4 mm and a second cutting angle 35 of 28°.

[0052] FIG. 6 shows a section through a second variant of the flat portion 7, along the section line V-V shown in FIG. 2. The flat portion 7 has a radiused cutting edge 32.

[0053] The blade is distinguished by a particularly high degree of operational reliability as well as by a particularly high cutting performance.

LIST OF REFERENCE SIGNS

[0054] 1 blade [0055] 2 hand blender [0056] 3 rotation axis [0057] 4 knife [0058] 5 cutter [0059] 6 serration [0060] 7 flat portion [0061] 8 first cutter thickness [0062] 9 second cutter thickness [0063] 10 serration starting point [0064] 11 serration finishing point [0065] 12 first spacing [0066] 13 apex [0067] 14 second spacing [0068] 15 first gradient [0069] 16 second gradient [0070] 17 first center [0071] 18 first tangent [0072] 19 central axis [0073] 20 second center [0074] 21 second tangent [0075] 22 depth [0076] 23 serration width [0077] 24 housing [0078] 25 cutting head [0079] 26 opening [0080] 27 radial direction [0081] 28 end region [0082] 29 end region width [0083] 30 tip [0084] 31 region [0085] 32 cutting edge [0086] 33 connecting line [0087] 34 first cutting angle [0088] 35 second cutting angle [0089] 36 portion width [0090] α first angle [0091] β second angle